279479721 has 16 divisors (see below), whose sum is σ = 393147200. Its totient is φ = 176110848.

The previous prime is 279479689. The next prime is 279479741. The reversal of 279479721 is 127974972.

It is not a de Polignac number, because 279479721 - 2⁵ = 279479689 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (279479741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20685 + ... + 31413.

It is an arithmetic number, because the mean of its divisors is an integer number (24571700).

Almost surely, 2^279479721 is an apocalyptic number.

It is an amenable number.

279479721 is a deficient number, since it is larger than the sum of its proper divisors (113667479).

279479721 is a wasteful number, since it uses less digits than its factorization.

279479721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11208.

The product of its digits is 444528, while the sum is 48.

The square root of 279479721 is about 16717.6469935215. The cubic root of 279479721 is about 653.8078043472.

The spelling of 279479721 in words is "two hundred seventy-nine million, four hundred seventy-nine thousand, seven hundred twenty-one".